<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>three.js-Drawing lines</title>
</head>
<body>
  <script src="./js/three.js"></script>
  <script>
    // 定义渲染器
    const renderer = new THREE.WebGLRenderer();
    renderer.setSize( window.innerWidth, window.innerHeight ); // 渲染器设置宽高
    document.body.appendChild( renderer.domElement ); // 添加页面canvas绘制

    const camera = new THREE.PerspectiveCamera( 45, window.innerWidth / window.innerHeight, 1, 500 ); // 定义透视相机
    camera.position.set( 0, 0, 100 );
    camera.lookAt( 0, 0, 0 );

    const scene = new THREE.Scene();

    //create a blue LineBasicMaterial
    const material = new THREE.LineBasicMaterial( { color: 0x0000ff } );

    const points = [];
    points.push( new THREE.Vector3( - 10, 0, 0 ) );
    points.push( new THREE.Vector3( 0, 10, 0 ) );
    points.push( new THREE.Vector3( 10, 0, 0 ) );

    const geometry = new THREE.BufferGeometry().setFromPoints( points );

    const line = new THREE.Line( geometry, material );

    scene.add( line );
    renderer.render( scene, camera );
  </script>
</body>
</html>